Co-managing partners Philmore H. Colburn II, left, and Michael A. Cantor stand outside Cantor Colburn’s Hartford office at 20 Church St., colloquially known as the “Stilts Building,” in downtown Hartford. They and the firm’s 200 employees gathered May 31 to unveil and toast the firm’s 12-foot by 9-foot logo mounted on the tower at the corner of Main Street.